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SOUTH POLAR SKUA Stercorarius Maccormicki Stercorarius

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SOUTH POLAR SKUA Stercorarius Maccormicki Stercorarius SOUTH POLAR SKUA Stercorarius maccormicki Document made by the French Southern and Antarctic Lands © TAAF Lands © Southern and Antarctic the French made by Document l l assessm iona asse a g ss b e e m lo n r • Size : 50-55 cm t F G e A n t A SOUTH POLAR SKUA T • Wingspan : 130-140 cm Stercorarius maccormicki • Weight : 0.9-1.6 kg Order : Charadriiformes — Family : Stercorariidae GEOGRAPHIC RANGE : The species breeds throughout the Antarctic continent and Peninsula. It is one of the only Antarctic species that undergoes a transequatorial migration, wintering as far north as Alaska and Greenland. HABITAT : During the winter the species is pelagic and is found in warm and cold waters offshore. During the breeding season, South Polar Skuas settle on relatively snow-free areas in Antartica, sometimes near © S. BLANC penguin and petrel colonies. DIET : South Polar Skuas primarily feed at sea on fish and krill. In winter, they probably add carrion to their diet. BEHAVIOR : REPRODUCTION : South Polar Skuas forage several kilometers away The breeding season starts in November and from their colonies in flocks of about 100 birds. continues until February. South Polar Skuas form They gather around carcasses, and are known loose colonies on bare, open grounds along the to kill sick or weak birds of their own species. coast. Rocky outcrops allow a good view over Outside the breeding season, they surface plunge the territory. The ground is often covered with and attack petrels and shags to steal their prey in lichens and mosses in sheltered ice- and snow- © S. BLANC flight, grabbing them by the wings, tail or abdomen. free depressions. Nests are bare scrapes on the South Polar Skuas are very territorial during the ground, in soil or moss. Females lay two eggs and breeding season. They are monogamous, pair incubation takes 28 to 31 days. Nidifugous chicks for life, and usually show strong site fidelity. They leave the nest 24 to 48 hours after hatching and THREATS : perform threat displays with their wings spread out fledge after 36-45 days. Usually, only one chick The species is categorized as "Least wide, exposing whitish outer-wing patches while survives. concern" (IUCN Red List of Threatened giving harsh calls. Physical attacks and fighting may Species, August 2018). It has a wide occur, sometimes resulting in serious injuries. In range, and despite a mixed breeding established breeding pairs, the bond is renewed success and harsh weather conditions on the territory used year after year, but courtship affecting adults and juveniles, no factors displays are limited. They have a powerful flight are thought to pose a genuine threat to with fast wing-beats. this species at present. Document made by the French Southern and Antarctic Lands © TAAF Lands © Southern and Antarctic the French made by Document.
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